Orbital reconstruction and interface ferromagnetism in self-assembled nanosheet superlattices

Minoru Osada, Takayoshi Sasaki, Kanta Ono, Yoshinori Kotani, Shigenori Ueda, Keisuke Kobayashi

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

We have investigated the interface electronic states in self-assembled (Ti0.8Co0.2O2/Ti0.6Fe 0.4O2)n superlattices by X-ray photoelectron spectroscopy. A charge of about -0.3 electron is transferred from Fe to Co ions across the interface and induces a major reconstruction of the orbital occupation at the interfacial (Ti0.8Co0.2O 2/Ti0.6Fe0.4O2) layers. Supported by first-principles calculations, the Co3+ state is partially occupied at the interface by superlattice formation, and this new magnetic state directly influences the coupling between Ti0.8Co0.2O2 and Ti0.6Fe0.4O2 nanosheets. These data indicate that the orbital reconstruction is indeed realized by the interface charge transfer between Co and Fe ions in the adjoined nanosheets, and the generic feature of engineered interfaces can be extended to self-assembled superlattices of oxide nanosheets.

Original languageEnglish
Pages (from-to)6871-6879
Number of pages9
JournalACS Nano
Volume5
Issue number9
DOIs
Publication statusPublished - 2011 Sep 27
Externally publishedYes

Keywords

  • ferromagnetic nanosheets
  • interface ferromagnetism
  • layer-by-layer assembly
  • orbital reconstruction
  • X-ray photoemission spectroscopy

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)
  • Physics and Astronomy(all)

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